Saga Why go into hiding??

At the end of ROTS Yoda and Obi-Wan decide its better to go into hiding instead of facing Sidious again but why???

Yoda had faced Sidious and actually looked very strong against him and Obi-Wan defeated Anakin and could have ended his life if he'd wanted to....I've always wondered why Obi-Wan just left Anakin without delivering a fatal blow.

Surely the faster they faced Sidious the better because he was only going to get stronger with time.

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Palpatine was too powerful & the Jedi were the enemy of the state, even Bail took a risk helping them. It was a good move to lay low